US3041190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions and processes for making foamed alumina refractory products, and articles so produced
Assignee: EIDP Inc
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Filing: 1959-12-01
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Granted: 1962-06-26
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Expires: 1979-12-01
Abstract
No abstract record available.
Inventors
- 👤 James S Griffith
- 👤 Rangwald S Olsen
- 👤 Harold L Rechter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/10; C04B18/00; C04B18/02; C04B18/027
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
IN A PROCESS FOR PRODUCING REFRACTORY PRODDUCTS HAVING LOW THERMAL CONDUCTIVITY THE STEPS COMPRISING WHIPPING AN INERT GAS INTO AN AQUEOUS DISPERSION COMPRISING A MIXTURE OF AT LEAST 2% OF COLLOIDAL ALUMINA HAVING THE BOEHMIDTE CRYSTAL STRUCTURE AND AT LEASTS 0.25% OF AN ORGANIC FOAMER, BOTH PERCENTAGES BEING BY WEIGHT BASED ON THE TOTAL WEIGHT OF SOLIDES IN THE MIXTURE, TO FORM A WET FOAM, DRYING THE FOAM AT A TEMPERATURE OF UP TO 150* C., AND FIRING THE DRIED PRODUCT AT A TEMPERATURE OF UP TO 1700*C. UNTIL CERAMIC BONDING OCCURS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |